Ticona Gmbh

Aventis Research & Technologies Gmbh & Co Kg

Celanese Chemicals Europe Gmbh

Hoechst Research & Technology

Harald Werner

Uwe Dingerdissen

Alfred Hagemeyer

Heinz Alexander

Klaus K&uuml;hlein

Alfred Gerhard Hagemeyer

Elke Schweers

John M Thomas

Gerhard Geiss

Rolf Peter Schulz

Brian F G Johnson

T Maschmeyer

D S Shephard

Stephan Weidlich

Helmut Tr&auml;nkler

Elfriede Hufsky

Andrea Rutsch

Frank Olschewski

Gerhardt Geiss

Klaus Kühlein

Günter Dambeck

The invention relates to a supported catalyst and the production and use thereof in the synthesis of vinyl acetate in the gaseous phase from ethylene, acetic acid and oxygen, or from gases containing oxygen, whereby the activity and selectivity are simultaneously improved. The catalyst contains palladium, at least one alkali metal compound and optionally one or more catalyst accelerators, in particular, gold, barium and/or cadmium on a porous support. Said support contains at least one reducible metal oxide, in particular oxides of the elements of groups IIIb, IVb, Vb, VIb from the periodic table of elements. Once the support has been loaded with at least one palladium compound, a reduction is carried out at a temperature of &#x3e;200&#xb0; C.

Catalysts for the gas-phase oxidation of ethylene and acetic acid to vinyl acetate, a process for producing them and their use

Supported catalysts having a high sintering stability and a process for producing them

A process for the gas-phase trimerization of formaldehyde to give trioxane using solid phosphoric acid catalysts. Particularly suitable catalysts for this process are SPA catalysts (solid phosphorous acid), for example &ldquo;silicon phosphates&rdquo;. The main advantage of this catalyst system is its simple and inexpensive production and ready availability and also, in particular, its improved long-term stability compared to the few previously described catalysts which are mostly based on supported heteropolyacids.

Trimerization of formaldehyde in the gas phase

Process for the catalytic oxidation of 1,5-dialkylbicyclo(3.2.1)octan-8-ol to give 1,5 dialkylbicyclo(3.2.1)octan-8-one

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Bad Homburg, Germany

Harald Werner